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Ubiquitous problem of learning system parameters for dissipative two-level quantum systems: Fourier analysis versus Bayesian estimation

Schirmer, Sophie G. and Langbein, Frank C. 2015. Ubiquitous problem of learning system parameters for dissipative two-level quantum systems: Fourier analysis versus Bayesian estimation. Physical Review A 91 (2) , -. 10.1103/PhysRevA.91.022125

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Abstract

We compare the accuracy, precision, and reliability of different methods for estimating key system parameters for two-level systems subject to Hamiltonian evolution and decoherence. It is demonstrated that the use of Bayesian modeling and maximum likelihood estimation is superior to common techniques based on Fourier analysis. Even for simple two-parameter estimation problems, the Bayesian approach yields higher accuracy and precision for the parameter estimates obtained. It requires less data, is more flexible in dealing with different model systems, can deal better with uncertainty in initial conditions and measurements, and enables adaptive refinement of the estimates. The comparison results show that this holds for measurements of large ensembles of spins and atoms limited by Gaussian noise as well as projection noise limited data from repeated single-shot measurements of a single quantum device.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Computer Science & Informatics
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Additional Information: PDF uploaded in accordance with publisher policy at http://sherpa.ac.uk/romeo/issn/1050-2947/ [accessed 04/02/2020]
Publisher: American Physical Society
ISSN: 1050-2947
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 13 January 2015
Last Modified: 04 Mar 2020 15:00
URI: http://orca.cf.ac.uk/id/eprint/83777

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